Which of the following adds/add nitrogen to the soil? 1. Excretion of urea by animals 2. Burning of coal by man 3. Death of vegetation Select the correct answer using the codes given below.
A1 only
B2 and 3 only
C1 and 3 only
D1, 2 and 3
Answer & Solution
Correct answer: C. 1 and 3 only
UPSC CSE Prelims 2013 (GS-I, Set A), Q.34. Official answer key: C.
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